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I couldn't resist playing around with a few numbers to give a comparison of power to weight for the many 996 variants compared to a standard face-lift C2. So a 3.6 320bhp C2 gives a baseline of 100%. As we're looking DIN weights and bhp for all cars the percentage variances should be a valid comparison.
As leemich sounds like he's looking at a rare x51 kitted car (fitted as standard to the Anniversary) I've added some of those. (I think I'm right in saying the x51 was only available as an option on the manual but I might be wrong). I thought I remebered there might also have been a x51 kit for the pre face-lift 3.4 cars giving 320bhp but I not sure if there was.
I've also added the x50 Turbo kit which also covers the final Turbo S variant that had it as standard.
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DIN Weights
1998-2002
Weight|Power | bhp/kg | Compared to C2 320bhp
[FONT=courier new"]C2 1320kg 300bhp 0.2273 97.30%
GT3 Mk1 1350kg 355bhp 0.2630 112.58%
C2 Tip 1365kg 300bhp 0.2198 94.09%
C4 1370kg 300bhp 0.2190 93.75%
C2 Cab 1395kg 300bhp 0.2151 92.07%
C4 Tip 1415kg 300bhp 0.2120 90.77%
C2 Cab Tip 1440kg 300bhp 0.2083 89.19%
C4 Cab 1445kg 300bhp 0.2076 88.88%
C4 Cab Tip 1490kg 300bhp 0.2013 86.20%
Face Lift post MY 2002
GT3 Mk2 RS 1330kg 381bhp 0.2865 122.64%
C2 1370kg 320bhp 0.2336
100.00%
C2 (x51) 1370kg 345bhp 0.2518 107.81%
GT3 Mk2 1380kg 381bhp 0.2761 118.20%
C2 Tip 1425kg 320bhp 0.2246 96.14%
C4 1430kg 320bhp 0.2238 95.80%
C4 (x51) 1430kg 345bhp 0.2413 103.29%
GT2 Mk1 1440kg 462bhp 0.3208 137.36%
[FONT=courier new"]GT2 Mk2 1440kg 483bhp 0.3354 143.60%
[FONT=courier new"]Targa 1440kg 320bhp 0.2222 95.14%
C2 Cab 1450kg 320bhp 0.2207 94.48%
C4 Tip 1485kg 320bhp 0.2155 92.26%
Targa Tip 1495kg 320bhp 0.2140 91.64%
C4S 1495kg 320bhp 0.2140 91.64%
C4S (x51) 1495kg 345bhp 0.2308 98.80%
C2 Cab Tip 1505kg 320bhp 0.2126 91.03%
C4 Cab 1510kg 320bhp 0.2119 90.73%
C4S Tip 1550kg 320bhp 0.2065 88.39%
C4 Cab Tip 1565kg 320bhp 0.2045 87.54%
C4S Cab 1565kg 320bhp 0.2045 87.54%
Turbo 1590kg 420bhp 0.2642 113.09%
Turbo S (x50) 1590kg 450bhp 0.2830 121.17%
C4S Cab Tip 1620kg 320bhp 0.1975 84.57%
Turbo Tip 1630kg 420bhp 0.2577 110.31%
TurboS Tip(x50) 1630kg 450bhp 0.2761 118.19%
Turbo Cab 1660kg 420bhp 0.2530 108.32%
TurboS Cab(x50) 1660kg 450bhp 0.2711 116.06%
Turbo Cab Tip 1700kg 420bhp 0.2471 105.77%
TurboS Cab Tip(x50)1700kg 450bhp 0.2647 113.33%